ci: fix docker registry names to lowercase

Author: camille-004

.github/workflows/ci.yml

@@ -87,7 +87,7 @@ jobs:
         id: meta
         uses: docker/metadata-action@v5
         with:
-          images: ghcr.io/${{ github.repository }}/ci-py${{ matrix.python-version }}
+          images: ghcr.io/nvidia/cutile-python/ci-py${{ matrix.python-version }}
           tags: |
             type=sha,prefix={{branch}}-
 
@@ -143,7 +143,7 @@ jobs:
     if: needs.check-changes.outputs.source-changed == 'true'
     timeout-minutes: 30
     container:
-      image: ghcr.io/${{ github.repository }}/ci-py${{ matrix.python-version }}:${{ github.ref_name }}-${{ github.sha }}
+      image: ghcr.io/nvidia/cutile-python/ci-py${{ matrix.python-version }}:${{ github.ref_name }}-${{ github.sha }}
       credentials:
         username: ${{ github.actor }}
         password: ${{ secrets.GITHUB_TOKEN }}
@@ -176,7 +176,7 @@ jobs:
     if: always() && (needs.check-changes.outputs.source-changed == 'true' || needs.check-changes.outputs.docs-changed == 'true')
     timeout-minutes: 15
     container:
-      image: ghcr.io/${{ github.repository }}/ci-py3.10:${{ github.ref_name }}-${{ github.sha }}
+      image: ghcr.io/nvidia/cutile-python/ci-py3.10:${{ github.ref_name }}-${{ github.sha }}
       credentials:
         username: ${{ github.actor }}
         password: ${{ secrets.GITHUB_TOKEN }}